and nespresso-us.Com. Incredible video of an l.A. Motorist trapped in a burning vehicle, unconscious. He survives thanks to the kindness and bravery of strangers who pulled over on the highway. Here's abc's correspondent. Reporter: A terrific crash followed by a fiery blaze. Oh, my god. Reporter: A scene that most people would run from. I saw this car -- just veer into the -- into the retaining wall. Right after the impact. It, it went all the way across all lanes of the 405. It looked to me like, a classic nascar type of collision. Because of the speed was pretty high. It went all the way across. Soon as it hit the rail, there was fire, fire just came from the vehicle. There is nothing anybody can do, man. In what many are calling ate true christmas miracle, officer thompson didn't hesitate to help. Managed to get my vehicle over. I jumped out of the car and ran to the car. And, I got to the door of the car. And I tried to open it. He found the driver unconscious with his seatbelt stuck. I started fumbling again. And, I just keep thinking, the heat, the heat. And I -- and the fire. And smoke. And i, I found that button. I hit the button. And soon as that belt released. It was just -- relief. It came. I was just relief. The button came off. I grabbed him. And I -- began pulling himut of the car. And he, he felt as if he only weighed one pound. He was so light. When I grabbed him. Local actor drew gash among the witnesses. It was like four lanes of traffic. I didn't want to be, add to the problem, get hit by a car. You juwanted to help? But couldn't? Yeah. He may not have reached there in time any way. He jumped in. Opened the car door. Reached in there, grabbed this guy out. Literally, not exaggerating, if that cop hadn't grabbed that guy, if he was 3 seconds behind, it would have been too late. Reporter: Officer thompson was assisted by a few passers-by and the officer needed help as well. The smoke and heat left him disoriented at the scene. He felt like a feather. Soon as I got him out -- there was some good sa mare tmaritans nearby, people grabbed him. Grabbed me. They pulled both of us over the k-rail. You risked your life? Maybe. Maybe not. I know his life was definitely -- right there. He was either going to live or die. The opportunity was 10, 15 second, that's all he had. 10 second was all that officer thompson needed. Everyone is calling you a hero today, do you feel that way? No. Why? I just don't feel that way. If someone else did that for me, my family, wife, child. I would be the first in two call him a hero. I owe you my life. You saved my life. You stafd my chaved my child. I owe you. But turn the other way. I don't feel that way at all. That bomb squad officer walked away with burns on his

This transcript has been automatically generated and may not be 100% accurate.